--- a/unix/Makefile
+++ b/unix/Makefile
@@ -42,9 +42,9 @@
 # such as -DDOSWILD).
 
 # UnZip flags
-CC = cc#	try using "gcc" target rather than changing this (CC and LD
+CC ?= cc#	try using "gcc" target rather than changing this (CC and LD
 LD = $(CC)#	must match, else "unresolved symbol:  ___main" is possible)
-AS = as
+AS ?= as
 LOC = $(D_USE_BZ2) $(LOCAL_UNZIP)
 AF = $(LOC)
 CFLAGS = -O